County annual report · FIPS 30063
2019 Missoula County, MT Power Outage Report
In 2019, customers in Missoula County, MT went without power for an average of 0.0 hours, a total of 1,291 customer-hours (Montana average 0.6 hours). That ranks 23rd worst of 38 Montana counties and 2870th of 2,945 nationally.
Compared with MT, the US
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Missoula County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 12, 2019 21:30 | June 13, 2019 01:45 | 4h 15m | 120 | 187 |
| 2 | August 7, 2019 12:30 | August 7, 2019 17:15 | 4h 45m | 119 | 447 |
| 3 | July 23, 2019 22:15 | July 24, 2019 01:45 | 3h 30m | 68 | 89 |
| 4 | August 22, 2019 21:45 | August 23, 2019 01:00 | 3h 15m | 32 | 90 |
| 5 | May 16, 2019 22:00 | May 17, 2019 01:30 | 3h 30m | 18 | 63 |
| 6 | May 17, 2019 19:30 | May 17, 2019 19:45 | 15m | 18 | 5 |
| 7 | December 24, 2019 04:00 | December 24, 2019 06:15 | 2h 15m | 13 | 29 |
| 8 | April 6, 2019 19:15 | April 6, 2019 21:45 | 2h 30m | 11 | 23 |
| 9 | December 27, 2019 18:00 | December 27, 2019 23:30 | 5h 30m | 11 | 29 |
| 10 | December 30, 2019 16:30 | December 31, 2019 00:00 | 7h 30m | 8 | 33 |
Outage episodes by size in 2019: 2 reached 100+ customers, 0 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Missoula County reported on EIA Form 861 for 2019, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2018 | 1.7 hrs | 1.08 | 1.7 hrs | 1.08 |
| Missoula Electric Coop, Inc | 2018 | 4.0 hrs | 1.49 | 2.8 hrs | 1.31 |
| Ravalli County Elec Coop, Inc | 2018 | 4.2 hrs | 1.53 | 2.5 hrs | 1.41 |
| Bonneville Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| USBIA-Mission Valley Power | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 75% of Montana's customers in 2019; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 57,348 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Missoula County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Missoula County, MT annual power outage report, 2019, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2019/montana/missoula-county